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\begin{equation*}s^2 t^2 + s^2 |u|^2 + t^2 |v|^2 + |v|^2 |u|^2 cos^2 x + |v|^2 |u|^2 sin^2 x + 2 s u \cdot  (v \times u) + 2 t v \cdot  (v \times u) =\end{equation*}
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